/*
 * Copyright © 2024 jsonwebtoken.io
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.jsonwebtoken.impl.security

import io.jsonwebtoken.impl.lang.Bytes
import org.junit.Test

import static org.junit.Assert.assertEquals

/**
 * @since 0.12.4
 */
class FieldElementConverterTest {

    static FieldElementConverter converter = FieldElementConverter.INSTANCE

    @Test
    void p384CoordinateNeedsPadding() {
        def requiredByteLen = 48
        def coordBytes = Bytes.random(requiredByteLen - 1) // one less to see if padding is applied
        def coord = new BigInteger(1, coordBytes)
        byte[] result = converter.applyTo(coord)
        assertEquals requiredByteLen, result.length
        assertEquals 0x00 as byte, result[0]
        //ensure roundtrip works:
        assertEquals coord, converter.applyFrom(result)
    }
}
